On Friday, 28 November 2025 at 18:14:15 UTC, tzsz wrote:
Hello,
I'd like to ask if there is any way of creating a class
instance at a location given by a pointer.
In C++ this is usually done using new(pointer) MyClass(); and I
saw a post made by Walter Bright that suggested adding this to
D. The code from that post did not compile on my machine tho.
This is a newly added improvement, and only in the most recent
compiler
```d
struct S
{
int x;
}
void foo()
{
ubyte[S.sizeof] arr;
auto s = new(arr) S(1);
assert(arr == [1, 0, 0, 0]);
}
```
builds with 2.111.0. But it doesn't work (assert fails).
Apparently there was a bug here.
dmd-nightly does work.
See the [changelog
entry](https://dlang.org/changelog/2.111.0.html#dmd.placementNew).
-Steve
